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There are a lot of variables with your problem. I quilt for a living and I really would need to see a video to help you. Your machine is pretty portable and the issue is probably just operator error. I work for a Bernina dealership and we are instructed to be incredibly accommodating in these situations. Just take it in and ask for help.

Definatly it is an electronic issue. Have the cables checked to be sure there weren't any pinched between the covers etc. And that the plugs on them are seated properly. This they should do naturally. I have also seen this before when what is called the EEPROM chip went bad. Screen lit, no info. The EEPROM is a small chip, black and rectangular on the S-Print board,The EEPROM stores all the information for the machine to work. The screen will light but no info on the screen if its bad. Before replacing a whole circuitboard I would suggest replacing this. It just plugs and unplugs from the S-Print and much less expensive.
If your not feeling all that trustworthy if the tech can do it then ask that it be sent to Bernina in Illinois and repaired. It could take 6 weeks though.

these quite possibly be the balancing strips for the inside shaft i dont know how factory puts them on but im sure if you ran your machine at a higher speed it would start shaken if it does this would be your problem the other thing it could be is the sewing machines case strips on machine its self